å·²ç¥å¡é« A = 7.5 ç±³
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å¡æ¯ç®åºå¡åºé¿ Bï¼
A : B = 1 : 1.25
B = A Ã 1.25 = 9.375 ç±³
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å¾è¡å®çç®åºå¡é¿ Cï¼
C = â(A^2 + B^2)
= â(7.5^2 + 9.375^2)
= 12.00585795 ç±³
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ä¸è§å½æ°ç®åºå¡é¿Cï¼
C = 7.5/sin(acrtan(1/1.25))
= 12.00585795 ç±³
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S = AÃB / 2 = 7.5Ã9.375 / 2 = 35.15625 (å¹³æ¹ç±³)